Concatenate Field Or Group By In Report

I'm looking for a way to summarize multiple fields of data from the same column in a single field. I've seen this page but have been unable to get it to work. I save the code listed but do not know which of the example fields would relate to my table.

Code:
SELECT CompanyName, ConcatRelated("OrderDate", "tblOrders", "CompanyID = " & [CompanyID])
FROM tblCompany;

I saw that I can create a report and select "group by," but then all the columns appear on different lines rather than summarized on one line. Here is an example of how I would like the data to appear, separated by commas or with specific dates within parentheses. The reason I want them all on one line is to provide an easier to read/more succinct summary.

e.g.
ITEM
LOCATION
DATE

GORP
EAST
1/1/2012

GORP
EAST
2/1/2012

[code]...